// SPDX-License-Identifier: GPL-2.0
/*
 * Device access for Dollar Cove TI PMIC
 *
 * Copyright (c) 2014, Intel Corporation.
 *   Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
 *
 * Cleanup and forward-ported
 *   Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
 */

#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/module.h>
#include <linux/regmap.h>

#define CHTDC_TI_IRQLVL1        0x01
#define CHTDC_TI_MASK_IRQLVL1   0x02

/* Level 1 IRQs */
enum {
        CHTDC_TI_PWRBTN = 0,    /* power button */
        CHTDC_TI_DIETMPWARN,    /* thermal */
        CHTDC_TI_ADCCMPL,       /* ADC */
        /* No IRQ 3 */
        CHTDC_TI_VBATLOW = 4,   /* battery */
        CHTDC_TI_VBUSDET,       /* power source */
        /* No IRQ 6 */
        CHTDC_TI_CCEOCAL = 7,   /* battery */
};

static const struct resource power_button_resources[] = {
        DEFINE_RES_IRQ(CHTDC_TI_PWRBTN),
};

static const struct resource thermal_resources[] = {
        DEFINE_RES_IRQ(CHTDC_TI_DIETMPWARN),
};

static const struct resource adc_resources[] = {
        DEFINE_RES_IRQ(CHTDC_TI_ADCCMPL),
};

static const struct resource pwrsrc_resources[] = {
        DEFINE_RES_IRQ(CHTDC_TI_VBUSDET),
};

static const struct resource battery_resources[] = {
        DEFINE_RES_IRQ(CHTDC_TI_VBATLOW),
        DEFINE_RES_IRQ(CHTDC_TI_CCEOCAL),
};

static struct mfd_cell chtdc_ti_dev[] = {
        {
                .name = "chtdc_ti_pwrbtn",
                .num_resources = ARRAY_SIZE(power_button_resources),
                .resources = power_button_resources,
        }, {
                .name = "chtdc_ti_adc",
                .num_resources = ARRAY_SIZE(adc_resources),
                .resources = adc_resources,
        }, {
                .name = "chtdc_ti_thermal",
                .num_resources = ARRAY_SIZE(thermal_resources),
                .resources = thermal_resources,
        }, {
                .name = "chtdc_ti_pwrsrc",
                .num_resources = ARRAY_SIZE(pwrsrc_resources),
                .resources = pwrsrc_resources,
        }, {
                .name = "chtdc_ti_battery",
                .num_resources = ARRAY_SIZE(battery_resources),
                .resources = battery_resources,
        },
        {       .name = "chtdc_ti_region", },
};

static const struct regmap_config chtdc_ti_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .max_register = 0xff,
        /* The hardware does not support reading multiple registers at once */
        .use_single_read = true,
};

static const struct regmap_irq chtdc_ti_irqs[] = {
        REGMAP_IRQ_REG(CHTDC_TI_PWRBTN, 0, BIT(CHTDC_TI_PWRBTN)),
        REGMAP_IRQ_REG(CHTDC_TI_DIETMPWARN, 0, BIT(CHTDC_TI_DIETMPWARN)),
        REGMAP_IRQ_REG(CHTDC_TI_ADCCMPL, 0, BIT(CHTDC_TI_ADCCMPL)),
        REGMAP_IRQ_REG(CHTDC_TI_VBATLOW, 0, BIT(CHTDC_TI_VBATLOW)),
        REGMAP_IRQ_REG(CHTDC_TI_VBUSDET, 0, BIT(CHTDC_TI_VBUSDET)),
        REGMAP_IRQ_REG(CHTDC_TI_CCEOCAL, 0, BIT(CHTDC_TI_CCEOCAL)),
};

static const struct regmap_irq_chip chtdc_ti_irq_chip = {
        .name = KBUILD_MODNAME,
        .irqs = chtdc_ti_irqs,
        .num_irqs = ARRAY_SIZE(chtdc_ti_irqs),
        .num_regs = 1,
        .status_base = CHTDC_TI_IRQLVL1,
        .mask_base = CHTDC_TI_MASK_IRQLVL1,
        .ack_base = CHTDC_TI_IRQLVL1,
};

static int chtdc_ti_probe(struct i2c_client *i2c)
{
        struct device *dev = &i2c->dev;
        struct intel_soc_pmic *pmic;
        int ret;

        pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
        if (!pmic)
                return -ENOMEM;

        i2c_set_clientdata(i2c, pmic);

        pmic->regmap = devm_regmap_init_i2c(i2c, &chtdc_ti_regmap_config);
        if (IS_ERR(pmic->regmap))
                return PTR_ERR(pmic->regmap);
        pmic->irq = i2c->irq;

        ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
                                       IRQF_ONESHOT, 0,
                                       &chtdc_ti_irq_chip,
                                       &pmic->irq_chip_data);
        if (ret)
                return ret;

        return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, chtdc_ti_dev,
                                    ARRAY_SIZE(chtdc_ti_dev), NULL, 0,
                                    regmap_irq_get_domain(pmic->irq_chip_data));
}

static void chtdc_ti_shutdown(struct i2c_client *i2c)
{
        struct intel_soc_pmic *pmic = i2c_get_clientdata(i2c);

        disable_irq(pmic->irq);
}

static int chtdc_ti_suspend(struct device *dev)
{
        struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

        disable_irq(pmic->irq);

        return 0;
}

static int chtdc_ti_resume(struct device *dev)
{
        struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

        enable_irq(pmic->irq);

        return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(chtdc_ti_pm_ops, chtdc_ti_suspend, chtdc_ti_resume);

static const struct acpi_device_id chtdc_ti_acpi_ids[] = {
        { "INT33F5" },
        { },
};
MODULE_DEVICE_TABLE(acpi, chtdc_ti_acpi_ids);

static struct i2c_driver chtdc_ti_i2c_driver = {
        .driver = {
                .name = "intel_soc_pmic_chtdc_ti",
                .pm = pm_sleep_ptr(&chtdc_ti_pm_ops),
                .acpi_match_table = chtdc_ti_acpi_ids,
        },
        .probe = chtdc_ti_probe,
        .shutdown = chtdc_ti_shutdown,
};
module_i2c_driver(chtdc_ti_i2c_driver);

MODULE_DESCRIPTION("I2C driver for Intel SoC Dollar Cove TI PMIC");
MODULE_LICENSE("GPL v2");